216 lines
12 KiB
JSON
216 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-21734",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-12-29T08:45:45.756Z",
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"datePublished": "2025-02-27T02:12:11.663Z",
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"dateUpdated": "2026-08-05T11:54:03.438Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:54:03.438Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: Fix copy buffer page size\n\nFor non-registered buffer, fastrpc driver copies the buffer and\npass it to the remote subsystem. There is a problem with current\nimplementation of page size calculation which is not considering\nthe offset in the calculation. This might lead to passing of\nimproper and out-of-bounds page size which could result in\nmemory issue. Calculate page start and page end using the offset\nadjusted address instead of absolute address."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable code is reached only through the FASTRPC_IOCTL_INVOKE ioctl on the /dev/fastrpc-* character device, requiring local access to the system. There is no network-facing path into fastrpc_get_args().\nAC:L - The attacker fully and deterministically controls every input that produces the miscalculation — the overlap offset (via user-supplied overlapping args[i].ptr/length ranges), the in-page alignment of `args` (via nscalars-derived metalen and preceding buffer lengths), and the buffer length — so the wrong page count can be produced reliably on the first attempt with no race or unpredictable state.\nPR:L - No capability check exists anywhere on the ioctl path; an unprivileged process only needs to open the fastrpc device node, and the driver explicitly registers a non-secure node for untrusted applications to offload to unsigned PDs (`is_session_rejected()`), which is exactly how untrusted Android apps use CDSP.\nUI:N - The attacker performs the entire sequence (open, init, invoke) itself from its own process; no victim action of any kind is needed.\nS:U - The vulnerable component and the impacted memory are both the host Linux kernel, so the exploit stays within a single security authority — this is standard local kernel memory corruption/privilege escalation rather than a VM or hypervisor boundary escape.\nC:H - An over-computed pages[i].size hands the DSP a physical page descriptor covering kernel memory beyond the coherent copy buffer, and on the unsigned-PD path the attacker controls the DSP-side code that reads that mapping and returns the contents, yielding disclosure of adjacent kernel memory.\nI:H - The same out-of-bounds page grant is read/write from the coprocessor's side, so attacker-controlled DSP code can write into kernel memory adjacent to the DMA-coherent allocation, giving a corruption primitive usable for privilege escalation.\nA:H - The mismatched page list either lets the DSP corrupt kernel memory outside the buffer or, in the under-sized direction, causes SMMU context faults and DSP subsystem crashes/restarts, and the ioctl can be repeated at will by any process holding the device fd."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/misc/fastrpc.c"
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],
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"versions": [
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{
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"version": "02b45b47fbe84e23699bb6bdc74d4c2780e282b4",
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"lessThan": "c56ba3ea8e3c9a69a992aad18f7a65e43e51d623",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "02b45b47fbe84e23699bb6bdc74d4c2780e282b4",
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"lessThan": "c0464bad0e85fcd5d47e4297d1e410097c979e55",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "02b45b47fbe84e23699bb6bdc74d4c2780e282b4",
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"lessThan": "24a79c6bc8de763f7c50f4f84f8b0c183bc25a51",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "02b45b47fbe84e23699bb6bdc74d4c2780e282b4",
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"lessThan": "c3f7161123fcbdc64e90119ccce292d8b66281c4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "02b45b47fbe84e23699bb6bdc74d4c2780e282b4",
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"lessThan": "e966eae72762ecfdbdb82627e2cda48845b9dd66",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/misc/fastrpc.c"
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],
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"versions": [
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{
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"version": "5.2",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.2",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.129",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.78",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.14",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.13.3",
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"lessThanOrEqual": "6.13.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.14",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.2",
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"versionEndExcluding": "6.1.129"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "6.6.78"
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"versionEndExcluding": "6.13.3"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "6.14"
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/c56ba3ea8e3c9a69a992aad18f7a65e43e51d623"
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},
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{
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"url": "https://git.kernel.org/stable/c/c0464bad0e85fcd5d47e4297d1e410097c979e55"
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},
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{
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"url": "https://git.kernel.org/stable/c/24a79c6bc8de763f7c50f4f84f8b0c183bc25a51"
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},
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{
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"url": "https://git.kernel.org/stable/c/c3f7161123fcbdc64e90119ccce292d8b66281c4"
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},
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{
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"url": "https://git.kernel.org/stable/c/e966eae72762ecfdbdb82627e2cda48845b9dd66"
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}
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],
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"title": "misc: fastrpc: Fix copy buffer page size",
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},
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"adp": [
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"
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}
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],
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T19:36:37.586Z"
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}
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}
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]
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}
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} |